docs: Document stateful MCP session usage (Playwright)#522
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Hi Mason Daugherty (@mdrxy)! Since the related issue #33966 was closed as expected behavior (stateless client by default), this PR properly documents how users should implement the stateful session pattern to avoid the browser termination confusion. Could you take a quick look when you have a chance? Happy to make any adjustments! |
…right) This documents the crucial difference between `client.get_tools()` (stateless, creates a new MCP session per tool invocation) and `client.session()` (stateful, maintains connection across multiple tools). This addresses the common pitfall where browser sessions terminate immediately after navigation when using Playwright MCP tools with agents. Resolves langchain-ai/langchain#33966
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Resolves langchain-ai/langchain#33966
Summary
This PR documents the crucial difference between
client.get_tools()(stateless, creates a new MCP session per tool invocation) andclient.session()(stateful, maintains connection across multiple tools).This addresses the common pitfall where browser sessions terminate immediately after navigation when using Playwright MCP tools with agents, as reported in langchain-ai/langchain#33966. As noted by maintainers in that issue, this documentation belongs in the MCP adapters repository rather than the core langchain agent documentation.
Changes
MultiServerMCPClient.get_tools()to explicitly warn developers about the stateless per-call session behavior.examples/stateful_playwright_example.py) demonstrating a working Playwright agent.